Hodkin, DJ, Stewart, DI, Graham, JT et al. (1 more author) (2016) Coprecipitation of 14C and Sr with carbonate precipitates: The importance of reaction kinetics and recrystallization pathways. Science of the Total Environment, 562. pp. 335-343. ISSN 0048-9697
Abstract
This study investigated the simultaneous removal of Sr2+ and 14CO32- from an alkaline (pH >12) Ca(OH)2 solution by the precipitation of calcium carbonate. Initial Ca2+:CO32- ratios ranged from 10:1 to 10:100 (mM: mM). Maximum removal of 14C and Sr2+ both occurred in the system containing 10 mM Ca2+ and 1 mM CO32- (99.7% and 98.6% removal, respectively). A kinetic model is provided that describes 14C and Sr removal in terms of mineral dissolution & precipitation reactions. The removal of 14C was achieved during the depletion of the initial TIC in solution, and was subsequently significantly affected by recrystallization of a calcite precipitate from an elongate to isotropic morphology. This liberated >46% of the 14C back to solution. Sr2+ removal occurred as Ca2+ became depleted in solution and was not significantly affected by the recrystallization process. This reaction could form the basis for low cost remediation scheme for 90Sr and 14C in radioactively contaminated waters (<$0.25 reagent cost per m3 treated).
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 Published by Elsevier B.V. This is an open access article under the Creative Commons Attribution 4.0 International license. |
Keywords: | Carbonate; Remediation; Nuclear; Radiocarbon; Strontium-90 |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Earth Surface Science Institute (ESSI) (Leeds) |
Funding Information: | Funder Grant number NERC NE/L01405X/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 17 May 2016 09:06 |
Last Modified: | 23 Jun 2023 22:02 |
Published Version: | http://dx.doi.org/10.1016/j.scitotenv.2016.03.192 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.scitotenv.2016.03.192 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:97236 |